Clutch-guard



(No Model.)

D. TILTON.

CLUTCH GUARD.

Pa-fneril ted Mar. 25, 1884.

UNITED STATES PATENT OFFICE.

DAVID Timon, on HARTFORD, CONNECTICUT.

CLUTCH-GUARD.

SPECIFICATION forming part of Letters Patent No. 295,595, dated March25, 1884. Application filed August 27, 1883. (N model.) Patented inEngland December [6, 1878.

To all whom it may concern Be it known that I, DAVID TrnronflofHartford, in the county of Hartford and State of Connecticut, haveinvented a certain new and useful Improvement pertaining to a Clutch-Guard, of which the following is a description, reference being had tothe accompanying drawings, where- Figure 1 is a top view. Fig. 2 is aside view. Fig. 3is aview in central longitudinal vertical section onthe plane w m.

This improvement is one in that class of devices used in machines forcommunicating rotary motion, and at the same time letting the curs whichis likely to break the machinery, the device being so adjustable thatthis slip or stop of the rotary motion may be made to oc cur with theexertion of any particular amount of force or power. Devices for thispurpose have existed previous to the present improvement; and myimprovement consists in such combination and arrangement andconstruction of the partsas effectuates the desired re sult in animproved manner. 1

The letter a denotes a rotary disk fast upon the shaft 12, and driven bya belt running upon a the pulley e. On the side of this disk a pawl, cl,is pivoted, which pawl is provided with a tooth,d. This tooth fits intoa correspondingshaped mortise, e, made in the periphery of the disk 6,which is loose rotarily upon the shaft d, and bears upon its side, rigidwith it and appurtenant to it, a pinion, f. This pinion f is intendedfor meshing into a gear, which gear drives other machinery, notnecessary to be shown here.

parts slip or stop when some obstruction oc- The letter h denotes anextension spiral spring, which particular kind of spring is an essentialfeature of this presentimprovement. This spring holds the tooth on thepawl into the mortise in the disk e, and ordinarily by this contact ofthis tooth and this mortise the rotary motion which the disk a has isimparted to the disk e and the pinion, and thus on to the machinerydriven by the gear which meshes into the pinion f; but if someobstruction to said machinery occurs likely to break the same, then thespring h permits the free end of the pawl to rise, lifting the tooth outof its mortise, so that the disk a will continue to rotate withoutrotating the disk (2 and the machinery driven by it. As I have alreadysaid,

other devicesihave previously been used for this purpose; but experienceshows that a hinged pawl held to its work by an extension spiral springoperates where all the previous devices have failed to operate, and itis this particular construction of parts which forms my improvement.

I claim as my i'mprovement In a guard-clutch, the combination of therotary disk 4, the toothed pawl (Z, pivoted on the side thereof, theperipherally mortised disk e, bearing the appurtenant pinion f, and theextension spiral spring h, all substantially asdeseribed, and for thepurpose set forth.

- DAVID TILTON.

WVitnesses:

ALBERT O. TANNER, W. H. MARSH.

It is hereby certified that in Letters Patent N 0. 295,595, grantedMarch 25, 1884, upon the application of David Tilton, of Hartford,Connecticut, for an improvement in f Clutch-Guards,

follows: In line 28, the reference letter e should read 0,-

an error appears in the printedspecification requiring correction, asand that the Letters Patent,

should be read with this correction therein to make it conform to therecord of the case v ,in the Patent Office.

Signed, countersigned, and sealed this 15th day of April, A. D. 1884.

M. L. J OSLYN Acting Secretary of the Interior.

[SEAL] Oountersigned BENJ. BUTTERWORTH,

Commissioner of Patents.

